Create a transposed coordinate transformation matrix, that transforms 3D
coordinates of quadrilateral cell vertices so that the transformed vertices
of a plane cell are in the plane. The rotation is performed
w.r.t. the centres of quadrilaterals.

Parameters:

coors:array

The coordinates of cell vertices, shape (n_el, 4, 3).

Returns:

mtx_t:array

The transposed transformation matrix , i.e.
.

Notes

, where , , are unit
in-plane (column) vectors and is the unit normal vector,
all mutually orthonormal.